Half his eight to a



Hi B. Ton nQ STOVE-PIPE DAMPER.

Eaten-Led June 26,1877.

INVENTUR: HEN RV B IBDD 26.91am- ATM/5.,

W ITNEEEES:

N-FETERS, PHDTO-UTHOGRAFHER, WASHXNGTON, D C.

HENRY B. TODD, OF WEST MERIDEN, CONNECTICUT, ASSIGNOR OF ONE- HALF HISRIGHT TO A. W. TODD, OF SAME PLACE.

IMPROVEMENT IN STOVE-PIPE DAMPERS.

Specification forming part of Letters Patent No. 192,395, dated J nne26, 1877 application filed March 29, 1877.

To all whom it may concern:

Be it known that I, HENRY B. TODD, of West Meriden, in the county of NewHaven and State of Connecticut, have invented a new and usefulImprovement in Stove-Pipe Dampers; and I do hereby declare that thefollowing is a full and exact description of the same, reference beinghad to the accompanying drawings, and to the letters of reference markedthereon.

This invention consists, mainly. first, in the employment of anadjusting device of special construction for giving the damper thenecessary friction to hold it against accidental movement; and, second,in the special construction ofthe handle for turning the damper.

It further consists, also, in other details of construction, all ofwhich will be fully described hereinafter.

In the drawings, Figures 1 and 2 represent transverse sections of astove-pipe, showing the damper in a vertical and horizontal position,respectively; Fig. 3, a side view of the damper-plate detached; Fig. 1,,a vertical longitudinal section of the damper-handle, showingtheattachment of the shank; Fig. 1 a side view of a stove-pipe, showing thehandle and pointer; and Figs. 2,, and 2 sections through the lines a: .rand y y of Fig. 2, respectively.

To enable others skilled in the art to make and use my invention, 1 willnow proceed to describe fully its construction and manner of operation.

A represents a section of a stove or other pipe, constructed of anyproper diameter and length, and of any suitable material, which isprovided with the openings a a on opposite sides, as shown. B representsthe blade or damper proper, constructed generally in any approved formand of any proper materials, either cast or wrought, which isessentially provided upon one side of a central line with thesemicircular portions b b b raised upon each face of the plate inopposite directions, as shown, and upon the other with the angularportions b 11 b raised in a similar manner. The semicircular portionsare provided upon their adjacent faces with screw-threads, by

which means a proper socket is provided for sertion of a rod to turn thesame, a square head to receive a wrench, or a slot to receive ascrew-driver or equivalent device. D represents the handle, consistingof an angular shank, d, adapted to fit the corresponding raised portionson the damper; an annular recess or groove, (1 Fig. 2, adapted toreceive the edge of the pipe inclosing the opening through which thehandle extends; a shoulder, d adapted to bear against the outer wall ofthe pipe; a pointer or index, d to indicate the position of the damper;and an extension, 01 having a flange, 01 and shaft or tenon 01 whichlatter supports the knob or handle proper d secured thereto by the pind", as shown.

By means of the construction descrli metal portion of the handle, which,of course;

becomes heated readily by conduction, is in closed by the wooden knob,and, consequently, as the latter is grasped by the fingers to turn thedamper, there is no danger of burning them. A very strongconnection,,also, is thus made between the wood and metal by very simplemeans.

The operation of the parts described will be readily understood.

By turning the adj noting-screw in the proper direction the projection bof the damper may be caused to bear with sufficient pressure upon theadjacent wall of the pipe to prevent accidental movement. The damper iscaused to travel in a lateral direction when the adjusting-screw isturned, because the screw itself has no longitudinal movement, it beingheld by the contact of its shoulder with the inner wall of the pipe, andhere the damper must yield to the action of the screw-threads.

The adjustment of the damper by the handle does not diii'er materiallyfrom the ordinary manner. 7

Some of the advantages of construction are as follows: The parts aresimple in construction, easily put together, and not liable to get outof order. Very effective results are obtained. The damper is easilyadjusted, and when adjusted is positively held against accidentalmovement in any position in which it may be placed. The handle is heldfrom displacement by the groove in its shank. It may be operated withoutburning the fingers, the iron being wholly inclosed in the wood. Theround form of the handle makes it more convenient for operation, whilethe pointer indicates accurately the position of the damper.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In combination with the blade, having the projecting portion b uponone side, the adjusting-screw 0, attached to the other side,

and adapted to determine the amount of friction, substantially asdescribed.

2. In combination with theblade, having the raised projections providedwith screw-th reads, and the projecting portion 1), the adjustingscrew0, having the shoulder 0 as described.

3. In combination with the blade having the angular raised portion, asdescribed, and the stove-pipe having the proper opening, the handle I),having the angular shank d, and also the circular recess 11, adapted toreceive the edge of the stove-pipe opening, as described.

4. In combination with the metal shank d, having the flange d the woodenknob d inclosing the metal, as described.

5. The combination of blade B, the adjusting-screw G, and the handle D,substantially as described.

This specification signed and witnessed this 19th day of March, 1877.

HENRY B. TODD.-

Witnesses:

E. A. MERRIMAN, JAS. H. JoHNsoN.

